U dont need to care for lighting in sketches, just lines.

No problem bro, sharing the inspiration and great artists!

First sculpture I've made using Zbrush. Kinda hard for me since first time modelling organic subject. Getting used to brushes and dynamesh, polymesh. Didn't try polypaint and fibermesh parameters yet. In any case, I wanna ask sifu here if its better to use fibermesh to create hair, or just import the spline data to maya and remade it there? I dont know the workflow for better hair other than sculpting with alpha.

I'm potato just started 3 days ago lol. Lots of head scratching at first, cuz most of tutorials workflow zbrush to maya. So I'm kinda stuck with zbrush for now.
Thanks. 
Sculpting update - added skin texture via polypaint and refined fibermesh with multiple polygroup. Learned how to control lighting in general, HDRI in progress. Still don't know to fine tune output, so screencap for now is enough.

Yeah, I think so too. The problem with polymesh is that it is not the same with hair system in maya. here hair strands can be made/edit whenever you want on the curves. But polymesh is one time setup before the whole grooming thing...well, planning to redo it anyway. 
p/s: some ppl recommend inflate hair, but then the hair will lose its softness 

Thanks again~ 

This time remade hair, fiddling around with fiber material, but still wont look as good without soften shader. 
Planning to use maya or using blender with hairnet plugin. Former option is better with lots of tutorials, but have to learn another software....again.